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luas yg diarsir = luas persegi panjang - luas lingkaran
334.96 = 28 x 16 - π x r²
334,96 - 448 = 3,14 r²
113,04 = 3,14 r²
r² = 36
r = 6 (C)
14.
panjang busur = 60/360 x 2 x (22/7) x 21
= 1/6 x 2 x 22 x 3
= 22 (D)